JP6724608B2 - Jigs for assembling rolling bearings and mating cages - Google Patents

Description

The present invention relates to a rolling bearing provided with a matching cage and an assembling jig used for assembling the matching cage.

As a cage for holding rolling elements provided between an inner ring and an outer ring of a rolling bearing, a so-called double-hugging type cage is known (see Patent Document 1). For example, as shown in FIG. 7, the double-holding type retainer 114 has a pair of circular ring portions 115 and a plurality of column portions 116 connecting the circular ring portions 115. A space between the pair of pillars 116 adjacent to each other in the circumferential direction is a pocket 117 for holding the rolling element 113 arranged between the inner ring 111 and the outer ring 112.

The retainer 114 shown in FIG. 7 is a synthetic resin mating retainer, and is configured by connecting a pair of annular split bodies 121a and 121b. Each of the pair of divided bodies 121a and 121b has an annular portion 115 on one side and divided pillar portions 122a and 122b extending from the annular portion 115 in the axial direction. The column portion 116 is configured by connecting the 122b.

The split pillars 122a and 122b are connected by locking the locking portions 124 formed on the divided bodies 121a and 121b into locking grooves 131 formed on the mating divided bodies 121b and 121a. Done. The locking portion 124 includes a main body portion 125 that extends in the axial direction, and a locking protrusion 126 that is provided at the tip end portion of the main body portion 125 and that projects radially outward from the main body portion 125. The locking groove 131 has a shallow groove portion 132 that accommodates the main body portion 125 and a deep groove portion 133 that accommodates the locking protrusion 126, and is located between the axial inner surface 134 of the deep groove portion 133, that is, the shallow groove portion 132. When the axially inner side surface (locking surface) 126b of the locking projection 126 comes into contact with the step surface 134, the locking projection 126 is locked in the deep groove portion 133.

JP, 2009-144878, A

The pair of divided bodies 121a and 121b in the alignment holder shown in FIG. 7 are assembled using the assembling jig 150 through the steps shown in FIGS. The assembly jig 150 includes a pair of pressing members 151a and 151b formed in an annular shape. Then, as shown in FIG. 8A, in a state where the one divided body 121a is inserted between the inner ring 111 and the outer ring 112, the axial outer end surface 121a1 of the one divided body 121a is pressed to the one pressing member 151a. Support in. Further, in a state where the other divided body 121b is opposed to the one divided body 121a in the axial direction, the axial outer end surface 121b1 of the other divided body 121b is supported by the other pressing member 151b.

Then, by moving the other pressing member 151b in the direction of arrow A, the other divided body 121b is pushed toward the one divided body 121a side, and the locking portion 124 of the other divided body 121b is elastically deformed radially inward. 8B, the inner side in the radial direction of the locking groove 131 of the one divided body 121a is passed, and as shown in FIG. 8B, the locking projection 126 of the locking portion 124 is inserted into the deep groove portion of the locking groove 131. It is locked to 133.

However, as shown in FIG. 9A in which the portion B of FIG. 8A is enlarged, the axially outer end surface 121b1 of the other divided body 121b is inclined with respect to the radial direction due to a dimensional error during molding or the like. In this case, a gap s is formed between the radially inner portion of the outer end surface 121b1 and the other pressing member 151b. Therefore, as shown in FIG. 9B, the locking portion 124 of the other divided body 121b cannot be sufficiently pushed into the side of the one divided body 121a, and the base end portion of the locking surface 126b of the locking portion 124 is It does not reach the step surface 134 of the deep groove portion 133. In other words, the distance α from the end surface 151a1 to the base end of the locking surface 126b is larger than the distance β from the axially inner end surface 151a1 of the one pressing member 151a to the step surface 134. Therefore, the locking surface 126b is pressed against the radial inner end 134a of the step surface 134, and the frictional force causes the locking portion 124 to remain inclined inward in the radial direction, and the engagement between the locking projection 126 and the deep groove portion 133. Stopping may be incomplete.

The present invention has been made in view of the above circumstances, and a rolling bearing and a jig for assembling a matching cage that can surely assemble a pair of split bodies constituting the matching cage. The purpose is to provide.

The rolling bearing of the present invention includes a pair of bearing rings arranged to face each other in the radial direction, a plurality of rolling elements interposed between the pair of bearing rings, a pair of annular portions and the pair of annular portions. A retainer having a plurality of pillar portions connecting the pair of annular portions, and a pocket for accommodating the rolling element formed between the pillar portions adjacent to each other in the circumferential direction. A rolling bearing, wherein the alignment cage is configured by connecting a pair of split bodies that are split in two in the axial direction, wherein at least one of the split bodies faces the other split body. A locking portion that extends in the axial direction of the rolling bearing and has a locking projection that protrudes inward or outward in the radial direction is provided at the tip, and the locking projection is locked to the other split body. A locked concave portion is provided, and a projection portion projecting axially outward is provided at a position corresponding to at least an axial outer side of the locking portion on an axial outer end surface of the one divided body. ..

According to the above configuration, the axially outer end surface of the one divided body in which the engaging portion is formed is provided with the protruding portion at a position corresponding to the axially outer side of the engaging portion. By bringing the pressing member of the jig into contact and pushing the one divided body toward the other divided body, the locking protrusion of the one divided body can be reliably locked in the locked recess.

It is preferable that the projecting portion is provided on the entire circumference of the axially outer end surface of the one divided body.
With such a configuration, the contact area of the projecting portion with respect to the assembly jig can be made as large as possible, and deformation of one of the divided bodies when assembling the pair of divided bodies can be suppressed. The term "entire circumference" as used above means, of course, that the projection is formed on the axial outer end surface of one of the split bodies without a gap in the circumferential direction. When the region (for example, a groove or a hole) where the portion cannot be formed is included, the case where the protrusion is formed in the entire circumferential range excluding the region is also included.

The present invention is an assembly jig used for assembling a pair of divided bodies constituting a combined cage, wherein at least one of the divided bodies extends in the axial direction toward the other divided body and has a tip end. A locking portion having a locking projection protruding to one side in the radial direction or the outside is provided, and the other divided body is provided with a locked recess for locking the locking projection. The assembling jig includes a pair of pressing members that come into contact with the axial outer end surfaces of the pair of split bodies and press the pair of split bodies in the axial direction so as to approach each other, and press the one of the split bodies. The pressing member includes a protrusion that protrudes toward the divided body and abuts the axially outer end surface of the divided body at a position corresponding to the axially outer side of the locking portion.

According to the above configuration, the pressing member that presses the one divided body in which the locking portion is formed is in contact with the axial outer end surface of the divided body at a position corresponding to the outside in the axial direction of the locking portion. Since the pressing member pushes the one divided body toward the other divided body, the locking projection of the one divided body can be reliably locked in the locked recess.

According to the rolling bearing of the present invention, it is possible to reliably assemble a pair of split bodies that constitute the alignment cage.

It is sectional drawing of the rolling bearing which concerns on 1st Embodiment. It is a perspective view showing a cage of a rolling bearing. It is a perspective view which shows a part of one division body of a holder. It is sectional drawing of a rolling bearing which shows the process of assembling a pair of division body. It is a perspective view of the holder in a 2nd embodiment. It is sectional drawing of a rolling bearing which shows the process of assembling a pair of division body of a holder using the assembly jig which concerns on 3rd Embodiment. It is sectional drawing of the rolling bearing which concerns on a prior art. It is sectional drawing of a rolling bearing which shows the process of assembling a pair of division body of the cage|basket in a prior art. 8A is an enlarged view of a B portion of FIG. 8A, and FIG. 8B is an enlarged view of a C portion of FIG. 8B.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a sectional view of the rolling bearing according to the first embodiment. The rolling bearing 10 includes a pair of bearing rings 11 and 12, a plurality of rolling elements 13, and a cage 14. In the following description, the side closer to the center O in the axial direction of the rolling bearing 10 may be referred to as the inner side in the axial direction (or the inner side in the axial direction), and the side more distant from the center O in the axial direction may be referred to as the outer side in the axial direction (or Or outside in the axial direction).

The pair of bearing rings 11 and 12 includes a ring-shaped inner ring 11 and a ring-shaped outer ring 12 that is arranged to face the outer side of the inner ring 11 in the radial direction.
The plurality of rolling elements 13 are arranged between the inner race 11 and the outer race 12. The rolling element 13 of this embodiment is a ball, and the rolling bearing 10 is a deep groove ball bearing.

A raceway 11 a on which the balls 13 roll is formed on the outer peripheral surface of the inner ring 11. The track 11a has a substantially concave arc shape in cross section. A raceway 12a on which the balls 13 roll is formed on the inner peripheral surface of the outer ring 12. The track 12a has a substantially arcuate cross section.

FIG. 2 is a perspective view showing the cage 14 of the rolling bearing 10. As shown in FIGS. 1 and 2, the cage 14 holds the plurality of balls 13 at intervals in the circumferential direction. The retainer 14 has a pair of annular portions 15 located on both sides of the ball 13 in the axial direction, and a plurality of column portions 16 connecting the pair of annular portions 15. The pockets 17 for accommodating the balls 13 are formed between the pair of annular portions 15 and between the column portions 16 adjacent to each other in the circumferential direction. The cage 14 is a double-hugging type that holds the balls 13 from both sides in the axial direction.

The pocket 17 is formed in a circular shape when viewed in the radial direction. The inner surface of the pocket 17 has a concave curved surface shape along a spherical surface having a radius slightly larger than the outer peripheral surface of the ball 13. Therefore, a slight gap is formed between the pocket 17 and the outer peripheral surface of the ball 13. The pocket 17 may be formed in a quadrangular shape when viewed in the radial direction, and the ball 13 may be configured to be in contact with each side of the pocket 17.

The cage 14 is composed of a pair of split bodies 21a and 21b that are split into two in the axial direction. That is, one retainer 14 is formed by connecting the pair of divided bodies 21a and 21b. Each of the divided bodies 21a and 21b is made of synthetic resin and is molded by injection molding or the like. Each of the pair of divided bodies 21a and 21b has an annular portion 15 on one side and divided pillar portions 22a and 22b extending from the annular portion 15 toward the divided bodies 21a and 21b on the other side. Each of the divided pillar portions 22a and 22b constitutes a half of the pillar portion 16. The pair of divided bodies 21a and 21b are formed in the same shape, and the cage 14 is formed by abutting and connecting the divided pillar portions 22a and 22b with the pair of divided bodies 21a and 21b being inverted to each other. There is.

FIG. 3 is a perspective view showing a part of the one divided body 21 a of the cage 14. In FIG. 3, the other divided body 21b has exactly the same structure as the one divided body 21a except that the axial direction is opposite.
As shown in FIGS. 2 and 3, on the tip surfaces 22a1 and 22b1 of the divided pillar portions 22a and 22b of the divided bodies 21a and 21b, the locking portions 24 that extend in the axial direction toward the divided bodies 21b and 21a on the other side. Is provided. The locking portion 24 is a radially inner portion of the tip surfaces 22a1 and 22b1 of the divided column portions 22a and 22b, and is provided at a position deviated from the center C in the circumferential direction in the circumferential direction. The locking portion 24 reaches the axially outer end surfaces 21a1, 21b1 of the split bodies 21a, 21b on the mating side (see FIG. 2). The radially inner side surface 24a of the locking portion 24 constitutes a part of the inner peripheral surface of the divided bodies 21a and 21b.

The locking portion 24 has a main body 25 formed in a substantially rod shape, and a locking projection 26 provided at the tip of the main body 25. The main body 25 is formed in a quadrangular prism shape having a substantially quadrangular cross section.
The locking projection 26 has substantially the same width in the circumferential direction as the main body 25 and has a greater radial height than the main body 25. The locking projection 26 is flush with the radially inner side surface of the body portion 25 and protrudes radially outward from the radially outer surface 25a of the body portion 25. An inclined surface 26a is formed on the radially outer surface of the locking projection 26 so that the height of the locking portion 24 in the radial direction becomes smaller toward the front end side. A side surface of the locking protrusion 26 on the inner side in the axial direction, that is, a step surface 26b (see FIG. 3) between the locking projection 26 and the main body 25 contacts a deep groove portion (locked concave portion) 33 of a locking groove 31 described later. It is a locking surface that contacts.

A locking groove 31 extending in the axial direction is formed on the inner peripheral surfaces of the divided bodies 21a and 21b. The locking groove 31 is open at the tip end faces 22a1, 22b1 (end faces on the inner side in the axial direction) of the split column portion 22a and the end faces 21a1, 21b1 on the outer side in the axial direction of the split bodies 21a, 21b. The locking groove 31 is provided at a position biased to the side opposite to the locking portion 24 with respect to the center C in the circumferential direction of the tip surfaces 22a1, 22b1 of the divided pillar portions 22a, 22b. In this embodiment, the locking portion 24 and the locking groove 31 are adjacent to each other with the circumferential center C interposed therebetween.

As shown in FIG. 1, the locking groove 31 includes a shallow groove portion 32 arranged inside the cage 14 in the axial direction and a deep groove portion 33 arranged outside in the axial direction. The main body portion 25 of the locking portion 24 is inserted into the shallow groove portion 32, and the locking projection 26 of the locking portion 24 is inserted into the deep groove portion 33. The deep groove portion 33 of the present embodiment corresponds to the locked recessed portion of the present invention.

The circumferential groove width and the radial groove depth of the shallow groove portion 32 are formed to be substantially the same as or slightly larger than the circumferential width and the radial height of the main body portion 25. Further, the shallow groove portion 32 has substantially the same axial length as the main body portion 25.
The deep groove portion 33 has the same groove width as the shallow groove portion 32 and is formed deeper than the shallow groove portion 32. The groove width and groove depth of the deep groove portion 33 are formed to be substantially the same as or slightly larger than the width and height of the locking projection 26. Further, the deep groove portion 33 has substantially the same axial length as the locking projection 26.

Therefore, the locking portion 24 is entirely housed inside the locking groove 31 when inserted into the locking groove 31. Further, in the state where the locking portion 24 is housed in the locking groove 31, the locking surface 26 b of the locking projection 26 has an axially inner end surface 34 of the deep groove portion 33, that is, a step surface between the deep groove portion 33 and the shallow groove portion 32. 34, and the locking projection 26 is locked in the deep groove 33. As a result, the pair of divided bodies 21a and 21b are connected without separating in the axial direction.

The axially outer end surfaces 21a1, 21b1 of the respective divided bodies 21a, 21b are provided with a projecting portion 41 projecting axially outward. The protruding portion 41 is formed on a radially inner portion of the axially outer end surfaces 21a1, 21b1 of the divided bodies 21a, 21b. In particular, the projecting portion 41 is provided in the region of the inner half in the radial direction of the axially outer end surfaces 21a1, 21b1 of the split bodies 21a, 21b. Therefore, the protruding portion 41 is provided at a position corresponding to the axially outer side of the locking portion 24. In addition, the protruding portion 41 is provided substantially all around the axial outer end surfaces 21a1, 21b1 of the divided bodies 21a, 21b. Specifically, as shown in FIG. 2, in the radially inner region of the axially outer end surfaces 21a1, 21b1 of the divided bodies 21a, 21b, the entire circumferential direction except the portion where the locking groove 31 is formed. It is provided.

FIG. 4 is a sectional view of the rolling bearing showing a process of connecting the pair of divided bodies 21a and 21b. The cage 14 is attached to the rolling bearing 10 in which the rolling elements 13 are interposed between the inner ring 11 and the outer ring 12. An assembly jig 50 is used to assemble the pair of divided bodies 21 a and 21 b in the cage 14. The assembling jig 50 includes a pair of pressing members 51a and 51b. The pair of pressing members 51a and 51b are formed in an annular shape. The pressing members 51a and 51b are formed to have a quadrangular cross-sectional shape, and one side surface in the axial direction serves as contact surfaces 51a1 and 51b1 with respect to the divided bodies 21a and 21b.

In order to assemble the cage 14, first, as shown in FIG. 4(a), one of the divided bodies 21a is inserted between the inner ring 11 and the outer ring 12, and one of the pressing portions 41 of the divided body 21a is pressed by one. The contact surface 51a1 of the member 51a is brought into contact.
Next, the other divided body 21b is axially inserted between the inner ring 11 and the outer ring 12, and the contact surface 51b1 of the other pressing member 51b is brought into contact with the protrusion 41 of the divided body 21b.

Then, by moving the other pressing member 51b inward in the axial direction as indicated by arrow A, the other divided body 21b is axially pressed toward the one divided body 21a. As a result, the other divided body 21b is elastically deformed and tilted inward in the radial direction by the inclined surface 26a of the locking projection 26, as shown by the chain double-dashed line in FIG. The projection 26 passes through the shallow groove portion 32 of the locking groove 31 to reach the deep groove portion 33, and the other split body 21b elastically returns outward in the radial direction, whereby the locking projection 26 is inserted into the deep groove portion 33. .. As a result, the locking surface 26b of the locking projection 26 is locked to the step surface 34 of the deep groove portion 33, and the pair of divided bodies 21a and 21b are connected.

Since the protruding portion 41 is provided on the radially inner portion of the axially outer end surface 21b1 of the other divided body 21b, the radially inner portion of the divided body 21b is strongly pushed inward in the axial direction. Since the locking portion 24 is provided so as to be biased toward the inner side in the axial direction of the divided body 21b, the locking projections 26 of the locking portion 24 are pushed into the deep groove portion 33 of the locking groove 31 by pushing the pressing member 51b. It is inserted deeper in the axial direction, and the locking surface 26b surely contacts the step surface 34. Therefore, as in the prior art shown in FIG. 9B, the locking surface 126b of the locking projection 126 is hooked on the radially inner end 134a of the step surface 134 of the deep groove 133, whereby the locking portion 124 is inclined. The pair of split bodies 121a and 121b are not assembled as they are, and the locking projection 26 can be reliably locked to the deep groove portion 33.

The one pressing member 51a and the divided body 21a are in a stopped state, but move relatively to the other pressing member 51b and the divided body 21b, so that the locking portion provided on the one divided body 21a. 24 is inserted in the locking groove 31 of the other divided body 21b while inclining inward in the radial direction. Therefore, also with respect to one of the divided bodies 21a, the engagement projection 26 of the engagement portion 24 is axially inserted deeper into the deep groove portion 33 of the engagement groove 31 due to the action of the protruding portion 41, so that the engagement projection 26 can be securely held. It can be locked in the deep groove portion 33.

As described above, by providing the projecting portion 41 on the axial outer end surfaces 21a1, 21b1 of the pair of divided bodies 21a, 21b, the pair of divided bodies 21a, 21b can be completely connected, and the rolling bearing 10 can be used. At times, the cage 14 can reliably hold the rolling element 13, and the behavior of the rolling element 13 can be stabilized. Further, by providing the protrusion 41, it is possible to increase the strength of the divided bodies 21a and 21b.

[Second Embodiment]
FIG. 5 is a perspective view of the cage according to the second embodiment. The pair of split bodies 21a and 21b of the retainer 14 of the present embodiment are formed with the projecting portion 41 as in the first embodiment, but the projecting portion 41 is formed around the entire circumference of the split bodies 21a and 21b. Is not provided on the locking portion 24, and is partially provided only on a position corresponding to the outside of the locking portion 24 in the axial direction. Therefore, in this embodiment, the plurality of protrusions 41 are provided at intervals in the circumferential direction. Other configurations and the method of assembling the cage 14 are the same as those in the first embodiment. Therefore, the same effect as the first embodiment is obtained.

However, in the present embodiment, the range in which the protrusion 41 is provided in the circumferential direction is reduced, and the contact area of the protrusion 41 with the pressing members 51a and 51b (see FIG. 4) of the assembly jig 50 is also reduced. Therefore, the surface pressure at the protruding portion 41 increases, and the divided bodies 21a and 21b are easily deformed when the cage 14 is assembled. In this respect, in the first embodiment, since the projecting portion 41 is provided on substantially the entire circumference of the divided bodies 21a and 21b, the surface pressure from the pressing members 51a and 51b can be reduced, and the divided bodies 21a and 21b can be reduced. The deformation of 21b can be suppressed.

[Third Embodiment]
FIG. 6 is a cross-sectional view showing a process of assembling the cage using the assembling jig according to the third embodiment.
In the assembling jig 50 of this embodiment, a protruding portion 53 that protrudes toward the divided bodies 21a and 21b is formed on one side surface of the pair of pressing members 51a and 51b. The protrusions 53 are provided on the entire circumference in the radially inner region of the pressing members 51a and 51b or at intervals in the circumferential direction.

The procedure for assembling the retainer 14 using the pressing members 51a and 51b is the same as that in the first embodiment. Then, the projecting portions 53 of the pressing members 51 a and 51 b strongly push the radially inner portions of the divided bodies 21 a and 21 b inward in the axial direction, and the locking projections 26 of the locking portions 24 into the deep groove portions 33 of the locking grooves 31. On the other hand, the locking projection 26 can be securely locked in the deep groove 33 by inserting the locking projection 26 deeper in the axial direction.

Therefore, also in the present embodiment, the same operation and effect as those of the first embodiment can be obtained. However, since the projecting portion 53 is formed on the pressing members 51a and 51b, if the axial centers of the divided bodies 21a and 21b and the pressing members 51a and 51b deviate from each other, the projecting portion 53 will not be properly placed on the divided bodies 21a and 21b. It cannot contact the position, that is, the radially inner region. Therefore, in this respect, it is more preferable to provide the projecting portion 41 on the divided bodies 21a and 21b side as in the first embodiment.

The present invention is not limited to the above-described embodiment, and the design can be changed within the scope of the invention described in the claims.
For example, in the above embodiment, the locking portion 24 and the locking groove 31 are formed on both the pair of divided bodies 21a and 21b, but the locking portion 24 is formed on one of the pair of divided bodies 21a and 21b. Only the locking groove 31 may be formed on the other side. Further, in each of the divided bodies 21a and 21b, only one of the engaging portion 24 and the engaging groove 31 may be formed in one divided pillar portion 22a and 22b.

In each of the above-described embodiments, the locking portion 24 is provided inside the split bodies 21a and 21b in the radial direction, but may be provided outside in the radial direction. In this case, the protruding portion 41 may be formed at a position corresponding to the axially outer side of the locking portion 24, that is, in the radially outer region of the axially outer end surfaces 21a1, 21b1 of the split bodies 21a, 21b.
In each of the above embodiments, the case where the rolling element 13 is a ball has been described, but the rolling element 13 may be a roller, that is, the rolling bearing 10 may be a roller bearing. Further, the rolling bearing 10 of another type may be used in which the cage 14 has the two divided bodies 21a and 21b.

10: Rolling bearing, 11: Inner ring (race ring), 12: Outer ring (race ring), 13: Rolling element, 14: Retainer, 15: Annular portion, 16: Pillar portion, 17: Pocket, 21a: Split body , 21a1: Axial outer end surface, 21b: Divided body, 21b1: Axial outer end surface, 24: Locking part, 26: Locking protrusion, 26b: Locking surface, 31: Locking groove, 33: Deep groove part, 34 : Step surface, 41: protruding portion, 50: assembly jig, 51a: pressing member, 51b: pressing member, 51b1: contact surface, 53: protruding portion

Claims (3)

A pair of bearing rings arranged to face each other in the radial direction, a plurality of rolling elements interposed between the pair of bearing rings, a pair of annular portions and a plurality of column portions connecting the pair of annular portions. A holding cage in which a pocket for housing the rolling element is formed between the pair of annular portions and between the column portions that are adjacent to each other in the circumferential direction, and the holding cage is provided. A rolling bearing configured by connecting a pair of divided bodies that are divided into two in the axial direction,
At least one of the split bodies is provided with a locking portion that extends in the axial direction of the rolling bearing toward the other split body and has a locking projection at the tip that projects radially inward or outward to one side,
The other split body is provided with a locked recess for locking the locking projection,
A rolling bearing in which an axially outer end surface of the one of the split bodies is provided with a projecting portion projecting axially outward at least at a position corresponding to the axially outer side of the locking portion. The rolling bearing according to claim 1, wherein the projecting portion is provided on the entire circumference of the axially outer end surface of the one split body. An assembly jig used for assembling a pair of divided bodies constituting a combined cage,
At least one of the divided bodies is provided with a locking portion that extends in the axial direction toward the other divided body and has a locking projection at a tip thereof that protrudes radially inward or outward to one side, and the other divided body is provided. Has a locked recess for locking the locking protrusion,
The assembly jig includes a pair of pressing members that come into contact with the axial outer end surfaces of the pair of divided bodies and press the pair of divided bodies in the axial direction so as to approach each other,
The pressing member that presses the one divided body includes a protruding portion that protrudes toward the divided body and is in contact with the axial outer end surface of the divided body at a position corresponding to the axially outer side of the locking portion. There is a jig for assembly.

Images